The Rifftides staff is feverishly preparing a new batch of Doug’s Picks. (Well, all right, langorously preparing.) In the meantime, part three of that 1972 Brubeck concert in Rotterdam has appeared. If you have missed the previous installments, it’s the Brubeck Trio with Jack Six, bass, and Alan Dawson, drums. Gerry Mulligan and Paul Desmond were guests on the Newport Jazz Festival tour. Here is “Take the ‘A’ Train,” with notably muscular solos by Mulligan and Brubeck and Desmond in contrast with floating long tones.